This Handle is designed for arm wrestlers. It works the pronation and supination muscles (toproll or hook). Only one like it in the World. You can now work your wrist at different angles including the pouring tea angle. The ring acts like a cam so you have constant pressure thru-out the entire motion. I use a chain to keep everything aligned up and straight. You can now custom tune this handle to your style of arm wrestling. Heavy duty design. I also use a flat grip for the handle so you can use more twisting force. Left or right hand design. Can be used with a cable machine or bands. If I get enough interest in it I will make and sell these come August.